package com.itheima.intercepors;

import com.alibaba.fastjson.JSON;
import com.itheima.commen.BaseContext;
import com.itheima.commen.Result;
import com.itheima.entiry.Employee;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request= (HttpServletRequest) servletRequest;
        HttpServletResponse response= (HttpServletResponse) servletResponse;

        String requestURI = request.getRequestURI();

        String[] urls=new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/upload",
                "/user/sendMsg",
                "/user/login"
        };
        //网址在白名单中,直接放行
        boolean check = check(urls, requestURI);
        if (check){
            filterChain.doFilter(request,response);
            return;
        }
        //session中有登录标记,直接放行
        boolean msg = request.getSession().getAttribute("msg") != null;
        if (msg){
            Employee employee= (Employee) request.getSession().getAttribute("msg");
            Long id = employee.getId();
            BaseContext.setCurrentId(id);
            filterChain.doFilter(request,response);
            return;
        }
        //4-2、判断登录状态，如果已登录，则直接放行
        if(request.getSession().getAttribute("user") != null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("user"));

            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request,response);
            return;
        }
        //以上条件都不符合规则,给前端返回json字符串,使网页跳转到登录界面
        Result result=new Result(0,"NOTLOGIN");
        String jsonString = JSON.toJSONString(result);
        response.getWriter().write(jsonString);
    }
    public boolean check(String[] urls,String requestURI){
        for (String url : urls) {
            //使用路径匹配器PATH_MATCHER.match
            if (PATH_MATCHER.match(url,requestURI)){
                return true;
            }
        }
        return false;
    }


}
